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[perl #63124] Inconsistent warning for hex escape

February 10, 2009 05:33
[perl #63124] Inconsistent warning for hex escape
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This is a bug report for perl from,
generated with the help of perlbug 1.36 running under perl 5.10.0.

[Please enter your report here]

$ perl -wle'"a\x1"=~s/a(?=\x1)//'
Illegal hexadecimal digit ')' ignored at -e line 1.
Illegal hexadecimal digit ')' ignored at -e line 1.
Can't modify constant item in substitution (s///) at -e line 1, at EOF
Execution of -e aborted due to compilation errors.

The documented syntax for hex escapes is \xHH

* Why do I get a double warning
* Why does the assignment not warn

$ perl -wle'$_="a\x1)"'
Illegal hexadecimal digit ')' ignored at -e line 1.

Here it *does* warn

Same behaviour in 5.8.8

[Please do not change anything below this line]
Site configuration information for perl 5.10.0:

Configured by merijn at Tue Dec 18 13:34:32 CET 2007.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
    osname=linux, osvers=, archname=i686-linux-64int
    uname='linux nb09 #1 smp 20071119 15:02:58 utc i686 i686 i386 gnulinux '
    config_args='-Duse64bitint -des'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
    cc='cc', ccflags ='-fno-strict-aliasing -pipe -I/pro/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2 -g',
    cppflags='-fno-strict-aliasing -pipe -I/pro/local/include'
    ccversion='', gccversion='4.2.1 (SUSE Linux)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags ='-L/pro/local/lib'
    libpth=/pro/local/lib /lib /usr/lib /usr/local/lib
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/pro/local/lib'

Locally applied patches:

@INC for perl 5.10.0:

Environment for perl 5.10.0:
    LANGUAGE (unset)
    LOGDIR (unset)
    PERL_BADLANG (unset)
    SHELL=/bin/tcsh Perl Programming lists via nntp and http.
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